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        <h1 id="浏览器输入一个url到整个页面显示出来经历了哪些过程"><a href="#浏览器输入一个url到整个页面显示出来经历了哪些过程" class="headerlink" title="浏览器输入一个url到整个页面显示出来经历了哪些过程"></a>浏览器输入一个url到整个页面显示出来经历了哪些过程</h1><ol>
<li>输入URL  <a target="_blank" rel="noopener" href="http://www.baidu.com/">www.baidu.com</a></li>
<li>通过域名是访问不到服务器的，所以还需要将url解析成ip地址  —-》 DNS 解析 ：DNS是一个数据库，里面存放着很多URL和对应的ip地址 </li>
<li>建立TCP连接，在发送数据前建立通道 —-&gt;三次握手</li>
<li>发送HTTP请求</li>
<li>响应HTTP请求</li>
<li>页面渲染</li>
<li>断开连接   —–》四次挥手</li>
</ol>
<p>我们把这个过程看成是我们去向老师请假的过程</p>
<ol>
<li><p>首先我们需要去找到老师的办公室比如说是班主任室    —–&gt; 输入URL  www.班主任室.com</p>
</li>
<li><p>但是我们只知道班主任室这个名称是找不到的，我们需要把这个名称解析成具体的地址如 三栋三层左拐第一间 —–&gt; 这就是DNS解析(DNS可以一个数据库，里面存放着很多URL和对应的ip地址 )</p>
</li>
<li><p>我们历经千辛万苦终于到了班主任室的门口，这时我们需要确定老师有空我们能够进去，然后我们敲门说：”报告！”，然后老师正好有空说:”进”，我们得知老师有空然后就说:”那我进来了老师”     —–&gt; 这就是建立TCP链接的三次握手</p>
</li>
</ol>
<p><img src="/myblog/%E6%B5%8F%E8%A7%88%E5%99%A8%E8%BE%93%E5%85%A5%E4%B8%80%E4%B8%AAurl%E5%88%B0%E6%95%B4%E4%B8%AA%E9%A1%B5%E9%9D%A2%E6%98%BE%E7%A4%BA%E5%87%BA%E6%9D%A5%E7%BB%8F%E5%8E%86%E4%BA%86%E5%93%AA%E4%BA%9B%E8%BF%87%E7%A8%8B.assets/image-20211229180708397.png" alt="image-20211229180708397"></p>
<p><img src="/myblog/%E6%B5%8F%E8%A7%88%E5%99%A8%E8%BE%93%E5%85%A5%E4%B8%80%E4%B8%AAurl%E5%88%B0%E6%95%B4%E4%B8%AA%E9%A1%B5%E9%9D%A2%E6%98%BE%E7%A4%BA%E5%87%BA%E6%9D%A5%E7%BB%8F%E5%8E%86%E4%BA%86%E5%93%AA%E4%BA%9B%E8%BF%87%E7%A8%8B.assets/image-20211229181042227.png" alt="image-20211229181042227"></p>
<ol start="4">
<li>这时我们终于进来了，然后我们就跟老师说我想请个假  —-&gt;发送HTTP请求</li>
</ol>
<p><img src="/myblog/%E6%B5%8F%E8%A7%88%E5%99%A8%E8%BE%93%E5%85%A5%E4%B8%80%E4%B8%AAurl%E5%88%B0%E6%95%B4%E4%B8%AA%E9%A1%B5%E9%9D%A2%E6%98%BE%E7%A4%BA%E5%87%BA%E6%9D%A5%E7%BB%8F%E5%8E%86%E4%BA%86%E5%93%AA%E4%BA%9B%E8%BF%87%E7%A8%8B.assets/image-20211229181349288.png" alt="image-20211229181349288"></p>
<ol start="5">
<li>老师了解我们的情况后同意了请假，并且开了假条   —-&gt;响应HTTP请求</li>
</ol>
<p><img src="/myblog/%E6%B5%8F%E8%A7%88%E5%99%A8%E8%BE%93%E5%85%A5%E4%B8%80%E4%B8%AAurl%E5%88%B0%E6%95%B4%E4%B8%AA%E9%A1%B5%E9%9D%A2%E6%98%BE%E7%A4%BA%E5%87%BA%E6%9D%A5%E7%BB%8F%E5%8E%86%E4%BA%86%E5%93%AA%E4%BA%9B%E8%BF%87%E7%A8%8B.assets/image-20211229181459802.png" alt="image-20211229181459802"></p>
<ol start="6">
<li>然后我们就得到了假条成功出了学校 —&gt; 页面渲染</li>
<li>然后我们潇洒的去医院了   —–&gt;断开TCP连接 四次挥手</li>
</ol>
<p><img src="/myblog/%E6%B5%8F%E8%A7%88%E5%99%A8%E8%BE%93%E5%85%A5%E4%B8%80%E4%B8%AAurl%E5%88%B0%E6%95%B4%E4%B8%AA%E9%A1%B5%E9%9D%A2%E6%98%BE%E7%A4%BA%E5%87%BA%E6%9D%A5%E7%BB%8F%E5%8E%86%E4%BA%86%E5%93%AA%E4%BA%9B%E8%BF%87%E7%A8%8B.assets/image-20211229181913859.png" alt="image-20211229181913859"></p>

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